SNVS686J March   2011  – August 2015 LMZ22005

PRODUCTION DATA.  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
  4. 4 Revision History
  5. 5 Pin Configuration and Functions
  6. 6 Specifications
    1. 6.1 Absolute Maximum Ratings
    2. 6.2 ESD Ratings
    3. 6.3 Recommended Operating Conditions
    4. 6.4 Thermal Information
    5. 6.5 Electrical Characteristics
    6. 6.6 Typical Characteristics
  7. 7 Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
      1. 7.3.1 Synchronization Input
      2. 7.3.2 Output Overvoltage Protection
      3. 7.3.3 Current Limit
      4. 7.3.4 Thermal Protection
      5. 7.3.5 Prebiased Start-Up
    4. 7.4 Device Functional Modes
      1. 7.4.1 Discontinuous And Continuous Conduction Modes
  8. 8 Application and Implementation
    1. 8.1 Application Information
    2. 8.2 Typical Application
      1. 8.2.1 Design Requirements
      2. 8.2.2 Detailed Design Procedure
        1. 8.2.2.1 Design Steps
        2. 8.2.2.2 Enable Divider, RENT, RENB and RENH Selection
        3. 8.2.2.3 Output Voltage Selection
        4. 8.2.2.4 Soft-start Capacitor Selection
        5. 8.2.2.5 Tracking Supply Divider Option
        6. 8.2.2.6 CO Selection
        7. 8.2.2.7 CIN Selection
        8. 8.2.2.8 Discontinuous And Continuous Conduction Modes Selection
      3. 8.2.3 Application Curves
  9. 9 Power Supply Recommendations
  10. 10Layout
    1. 10.1 Layout Guidelines
    2. 10.2 Layout Examples
    3. 10.3 Power Dissipation and Thermal Considerations
    4. 10.4 Power Module SMT Guidelines
  11. 11Device and Documentation Support
    1. 11.1 Device Support
      1. 11.1.1 Third-Party Products Disclaimer
      2. 11.1.2 Development Support
    2. 11.2 Documentation Support
      1. 11.2.1 Related Documentation
    3. 11.3 Community Resources
    4. 11.4 Trademarks
    5. 11.5 Electrostatic Discharge Caution
    6. 11.6 Glossary
  12. 12Mechanical, Packaging, and Orderable Information

Package Options

Mechanical Data (Package|Pins)
Thermal pad, mechanical data (Package|Pins)
Orderable Information

1 Features

  • Integrated Shielded Inductor
  • Simple PCB Layout
  • Frequency Synchronization Input (650 kHz to
    950 kHz)
  • Flexible Start-up Sequencing Using External
    Soft-Start, Tracking and Precision Enable
  • Protection Against Inrush Currents and Faults Such as Input UVLO and Output Short Circuit
  • Junction Temperature Range –40°C to 125°C
  • Single Exposed Pad for Easy Mounting and Manufacturing
  • Fast Transient Response for Powering FPGAs and ASICs
  • Fully Enabled for WEBENCH® Power Designer
  • Pin Compatible With LMZ23605/LMZ23603/LMZ22003
  • Electrical Specifications
    • 30-W Maximum Total Output Power
    • Up to 5-A Output Current
    • Input Voltage Range 6 V to 20 V
    • Output Voltage Range 0.8 V to 6 V
    • Efficiency up to 92%
  • Performance Benefits
    • High Efficiency Reduces System Heat Generation
    • Tested to EN55022 Class B(1)
    • Low Component Count, Only 5 External Components
    • Low Output Voltage Ripple
    • Uses PCB as Heat Sink, No Airflow Required (1)
(1) EN 55022:2006, +A1:2007, FCC Part 15 Subpart B: 2007. See AN-2125 SNVA473 and layout for information on device under test. Vin = 12 V, Vo = 3.3 V, Io = 5 A

2 Applications

  • Point-of-load Conversions from 12V Input Rail
  • Time-Critical Projects
  • Space Constrained/High Thermal Requirement Applications
  • Negative Output Voltage Applications
    (see AN-2027 SNVA425)

3 Description

The LMZ22005 SIMPLE SWITCHER® power module is an easy-to-use step-down DC-DC solution capable of driving up to 5-A load. The LMZ22005 is available in an innovative package that enhances thermal performance and allows for hand or machine soldering.

The LMZ22005 can accept an input voltage rail between 6 V and 20 V and can deliver an adjustable and highly accurate output voltage as low as 0.8 V. The LMZ22005 only requires two external resistors and three external capacitors to complete the power solution. The LMZ22005 is a reliable and robust design with the following protection features: thermal shutdown, input undervoltage lockout, output overvoltage protection, short circuit protection, output current limit, and the device allows start-up into a prebiased output. The sync input allows synchronization over the 650- to 950-kHz switching frequency range.

Device Information(1)(2)

PART NUMBER PACKAGE BODY SIZE (NOM)
LMZ22005 NDW (7) 10.16 mm × 9.85 mm
  1. For all available packages, see the orderable addendum at the end of the data sheet.
  2. Peak reflow temperature equals 245°C. See SNAA214 for more details.

Simplified Application Schematic

LMZ22005 22005_SSch.gif

Efficiency 5-V Output at 25°C Ambient

LMZ22005 30132952.gif